Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ec99db3a0edc1359452d35438b1d291733e0a1408dfb17c6855050707387acc' 
  AND token = 'hY3Lkw/Yw017OpzwVvXSFm+f+M5V0r8RqVXzsMf/TmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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