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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'acac90e8562734e97ac76882eabbe707718ed75e1ea4a850f74fee66ab5f4371' 
  AND token = 'Dm6uKEb5hXp/4sj6fxKgUGzbMyPSdHjNbr9BsNLjwM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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