Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '557e2788d71d047894f11b2c2b18a4527e3b907e980d9856570c6d12b7d4cd1e' 
  AND token = 'QXObQLhSN1v1ZTorweDdAqbGXMV6HMzPLSLCnGkCOiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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