Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb9d41603abaad1650ab2b04df80cf47c1c08d8dff7a1280fb588a9627abeb55' 
  AND token = 'U8V6H9m3WhuGhCVaEYQlZ6sN7txR5esVRstjlIDFPc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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