Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da4b85d3c6c8f9896dabfcbfbb756f0a8ff8fd967180f724fec15191bc892c9d' 
  AND token = 'tsJOG1rQJPgMVbEBZsZncpiZfvOgoVAd5F8Ujf4YLLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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