Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7ebef46dc0c05b503786af4d97610d712b627c93529caa213c75dbba8f5c21d' 
  AND token = 'UYBmqJPLj4u0dlTv4YCv+EoNRWbPb4vwwYocQkWBLcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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