Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81ea10df8faae5145e8a6d7110644549f5497c6054b5cd467379d3d6e275bff9' 
  AND token = 'x4NnKVAcQ6f4BvO/j90lIaBv8dH4KcWiK42mVR4rZoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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