Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1bb61b199950ce02a460939609e7b7c72c47ac50bc5221318b499c6fe81c94a' 
  AND token = 'vZpuYZDojfbrTVYVxTmEA/dAOwD0vUrs06zBaFz2s9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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