Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15b537052c1404f3f608785218a3fdd1b40990a0efba6b9bddc643e60013d3e7' 
  AND token = 'R4T5Lb1MK37a8152wIbiyUhdqCIQkjGe0z3fzyRCHXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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