Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19462bd7675d0ba0c8800deface218b2058318be28baf19c78cfa88643cd158a' 
  AND token = 'ZI7AfCEmwN0Ub+ElqVSvIp10fwEUXEvAV3eH2E+hG2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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