Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a118f4f3fd81cfba98c007df5f5178720402012882f371d0de458a9e1e38cac0' 
  AND token = 'oDDaEbU0YOPmsFLiD9MHrnn6mtMoM0uC0L6aoBkr9Es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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