SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '14a6265928df3bc7d4f5d246c028d70ee9beb95d4eb378fbb082646f6e9f0d2e' 
  AND token = '5NxSJki3txdGzhDsDlXA4ZTT/qPKKgQts4S+Jw4J5QU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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