Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1bc717de4578a975563e304e83a00396e9ee9d345a5346b56967a8b0bb4c7d9' 
  AND token = 'Qp1itCMBX1jkUV7/d5qtxGBakfKlpIe1RjhT3VLqudA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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