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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'eee9ed54c756d8b481db5fbe99bd5f50f5bd5ed3e0463ca91d1a406caf0e2919' 
  AND token = 'L9EzQDJIGyEvbEhFGoKFOj7eHBgvQARMxXIhXut1znU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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