Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '446b3a5f23dabcdaae9a4034dbabdee7e27a31b7eb706b91a72ea98d5aaf2fda' 
  AND token = '50rKEH0Zwhb8/5T1vjEyZkiNbyJGuBg2tLcrKapOm1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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