Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c20a74254af806050ea565290009e4b1abb1759898a72269e9a2c7fd43e71d8' 
  AND token = 'OUs2LTyW2VxaSmSrXB/d1MSsfrvVaAExStFmANAXXfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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