Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '338076cc9080ed551566f1962251f2eb2488939787a3a123fe91cd9e200237cc' 
  AND token = 'PR15VQu1FG3PUAGVsnnUHRd8Z1/pOgZmaIIGaDoPucA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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