Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71e866082091ee0f6c53b8fb7a96345df3e969921b4873cdacce1e1aa133bf2c' 
  AND token = 'c3FhOQNdnLHmny98hCCY1B0S86gX+87HL0CmfHFUAPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}