Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b20fe3f3370a0752e7081b2896fa56a30b4215b652e4f9400fd9dc102cc03f75' 
  AND token = 'ilB2n0F1jrgENoHNX8k3pf7o1IM5NRAgZHbcr1VJvvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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