Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4db877c11a8943161796f0b45b88ab840a43ddc1db03247fc6e38417909e1a6' 
  AND token = 'EjrvJ12ybicYDI50izEQvyd+uoBTSLxxJTtV1imlALg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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