Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d0db30520afba63d7213d51e97e5ecdbdc8d91403370a2243cc90008f169ddd' 
  AND token = 'E+sqq3NBJdwq75Q3rl2xyge5nkczH/Na2dFA+R4FMVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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