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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3280081eb5e6d9816dc42e77820f85cc812d77298e8e6f5cc0efe9bce7a37081' 
  AND token = 'oajl8KuJfp/1llQPAk6bY8pEgnIj5Q6lUgCA9nvOlk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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