Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4848bf2b01b7d28cc6ee774f7e49fa74e24dbb0b83f9430fe83b150203b0767c' 
  AND token = 'OVmcBYvS4TJpmN3eqdNSfAaEggUGvRUjv+0hAh5awqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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