Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd84a05390619f1ef087b3bd4c05fe914160efbc6e2fef64a8c4aaa1b788c510' 
  AND token = '25ZYTdmnLXk/7rglnTqrr9vxEvRWy5S5oDGlsTWfzBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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