Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c490088d36e8a6092d2793ab0fe8494984de8a96e93e74627a9e6ad4808b6f0' 
  AND token = 'UH9j8aEGLMQ8viu33UHo3d5Qj+k9MNHeFmcf2OlcvSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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