Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23b33eba5ad140348d513d46bfb5d8857d1402e4cd0de74b010b3e6e077090e2' 
  AND token = 'lQS3K3IfvRGK8/yaKZSO5R5fVLg/ofhfpkvGp6KNNo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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