Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eb78c7699c440d5ab7495fbd6ca23b2e84bc682b76e13a069fe4f2a8a0056a6' 
  AND token = 'D7U4Yf5Zs95K51u8QAXr7HmPpsrkPhWQS9/L0Dki3rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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