Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10de1df1a1dcfb506511e2fe435c3a93bedd9650d0b0b5903006807bc0b3a893' 
  AND token = 'jNsnLPXvjpaajoQqshhQGp4qFrcfw8r2Np8AHnpxj6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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