Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ed30abb1a50b10f78ceb5688f37743171a3bacab9b76c1eaee7be254abcb294' 
  AND token = 'Pe8IJmFV2UJIi4Ex1eGiWoxIP6zFbNS9sC7ZLIFY2pM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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