Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6275b560a935bbe5da2f5fe9ea31d290aee59d10a4a0a4a8f9c1e1cb6d46a4e' 
  AND token = 'JFb9TGJvcPk0BrI7rAoAffDEsISyGSIRxKIPSdANhdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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