Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36499a09b21b344af9e62528781705f61f3cc0f39ab89a2f43c508ffa7d5a81c' 
  AND token = '9SIPohsmfJ+X+eFMNW+JMoqo/dyZ3LUrDjRMt9Jj1Jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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