Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c179f89f4158d85a49c638feb3d47e16740c2e33b4d01bec2d57ba7b4ce4b86' 
  AND token = '1eLn303QxX4eddi2Crr6pcbGzTtDgre2OT/AVj+OBe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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