Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a34ff4e3deca039a6ed48670aaa5a4bc76949d219b5fe137124e4ba566b87435' 
  AND token = 'L4fPm1Ja2jxgdPjeXA7BLBME88Kzhu1sGKT/h8v1aZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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