Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e4e3993261d738ee5c27fc15cf04c145dda1775b21bf72d7834f620868ea002' 
  AND token = '0pLQ17WnBFT/Pk+2fG8ixXjGfvmVqGtc8p7hFtOnIhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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