Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a15331b8ecb020e27da05c0e54e6aabde8b19f78d5c5ee8cf3eefc2fd6cedb8' 
  AND token = 'l56Na57RiE1eioe6+/G6WRaNCHO8nN4mWDGMny8ursA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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