Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51c44a23c96f31e5c1d8b11a81b5b5c291c137ee253e04315972a0b0c9d3dbe2' 
  AND token = 's092ivKfDeVOrmDptTzVExweH/mwpIrftU0lmmSBNP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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