Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aff5f4bd0c4526817dc61aafe4dcdb0a0d2df5a2ebacdd43013dcadab02ff34e' 
  AND token = '0u+2G35EycabgPj5RHtQnyxQElIlabIH+22CyLJkqws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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