Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bebe636c2f5dc7349e6ff46795da3c3e0259fcd5c4196adf3ffc3053679dca0e' 
  AND token = 'an2Ui0Lk4QIO9+lyJYYNGHu1yEXj+wUa9v4oiyYGjNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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