Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38dbdb6b4ec86b9e4fdf0ac9ea4d17ad48c957e737128a2e0ac0a731dcb807f0' 
  AND token = 'LiuUR4yNqDHkSAEU2d5Bx/WJscRKQOPMg9D+CU+Px0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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