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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'af3f01be9f53d7f0566f1e5a83a119e86909d744dd38d8632fa07ef91688b918' 
  AND token = 'wjrcwx2dJzQx5p+foVbQxEzMC3bSyJ7tDx4X5FYWTzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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