Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6277f673f82a947774c857ff555e76288e76426c447778d0e8ff1fad2137dc1d' 
  AND token = 'titibuXRb3/btRL9lsiZWOQ1jA0hYAzLsozI3BtNHO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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