SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '333e002433a763d555e6c5196ea2304d959ebf88f985560833d4d90686a1fadf' 
  AND token = 'JGg5nMebvuPQ/ZAG+Ty+RTprzap2LH9/Lvws5qch9hU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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