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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6653854c6b0c364a3d04701f4697cc33d82a35bb8d31312b1c0326cb1518f9c2' 
  AND token = 'oaV8c5gwWRW8/3vAW7KsUPS0B8LC2GL4NclIFKNoCXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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