Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e57d310856bc3e483e7fc15c043b6e19d34dbb402be2740152369385679d40a' 
  AND token = 'z8aaSlkKrv2pWEuQmL3PhtVqiqeYN464ce7fjSw40lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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