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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5da0fc7f056033c2ba8cd8510f4046dc0684c951f69a2ee0636177080b8febb1' 
  AND token = 'Z91ZLwIW3yNEEjIQp5Rh5Z+4sxd3Yoyv6gpj7jEgB5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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