Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5ff07eda7f8eff7974af0abaf342503179f341f564c3422746f40b9e0b0e49c' 
  AND token = 'mxAnQcD/B4NEH9c1DOauMpns0tS8KhrkQ9e7cE/t5Tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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