Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f474b51ab270dfddeb250a1f5e37c29f2f0400e10ca7adec91374192d53cb6ce' 
  AND token = 'acFtoGOa3dtDBJP1gfFd7OOzX0XIv8+iaQI8ceOOLik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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