Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd29431fa4c7df2c1a3304bde7841a21d4e0ef54dcf3224e24b08d469f4f46a41' 
  AND token = 'BiUXubqsNopUhxVxTb7T7+v2ObbGAai6TGbhbhl6Q4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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