Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7904e536b3a669f30a5c15f6c4f65f5097f3b80abbf5c18e65f722020c965238' 
  AND token = 'XGG5Qyik4Ou+3PbOfziemk7wLdQVrbrf3/IFQ3IT3oM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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