Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e39ecf9544a206658f496340faeaa08b50e0546db2f981c37b46b580a6db02b5' 
  AND token = 'ksfY7jtRQHM7/+YIYMnIoN3BkqefIB5X6RcD0xfg1sQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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