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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ad506ad3890341404533996311e8cbd72e1df645f3023750cd730efdc1d43674' 
  AND token = 'bRfU8u4cQqYdsJLN/qTbDz1ycMssEpQyTPyl+94zl6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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