Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b660af2be93ab6693af356425c73a9ad91d9041c29b403b780fca9d6f06eb74' 
  AND token = '1LlpDTO4w5VdTL6Vl48GpLjVYGv6saLAQpFRcnuq/ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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