Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1f7df867d3f2035fe4f93747c1e1c42f1ac79fcb66f82e6f8410837b7c99c02' 
  AND token = '7E3OlBQUzWeZTLbjzywBme7SlXv9vkqw6NdZOurWIBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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