Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71aea7b30d1c219668476ae4ce23ef1dda21ff889000568f3e9e10d897c9e9f4' 
  AND token = '5qHrn/p75ZDtY92TPvzZa46xfWHulM8904C91lRov8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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