SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'af2dea97434125b9fb219a9e9b4fd07df287805be21df6e553157b8ccb724822' 
  AND token = 'qNTqjrN0Ov9GCr0jLN5gvT62zXkN3LYOOmJ37zMqPMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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