Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f2864f225bb5a03ce635cdaf60b5490b27d64257e6985ac5627445e7647740f' 
  AND token = '7C8O3DilX3kv+4CpsMzz2p/PTIvjIn2lcoX85TZTHn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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