Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dc2d0b082705ab3a55d46b54f66f0251dc6fa7c87c26ef1c019b4338f44f545' 
  AND token = 'MUDcx58mhnk+tz0KLDJdo7d1gT55BnJYfwMMf2PwphA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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