Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bcc0daee312ffdda8f628cb0bb438c3b547644d0d58ad8ffb1edd8a828b9138' 
  AND token = '5/ztnDqo0KMMQy3c7ZhjVfyZ2yKwD0ec6kH9kVaNaCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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