SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '318d0d17f48b116da4d0c25a4db4371830f6459247fbc108435c7dd12b6e2e69' 
  AND token = 'kzgYHTPJ6Y9MsLE7UTrzlsNFH5qB6GZbSNK8goKl44A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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