Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b266840784a2f4796dcab2d02f8e447253e08830f7df85da81cef41a16a94548' 
  AND token = 'ZpqB4+E8lidyhrJ5CEs56xZAtW3CIKBH/Ot5E66StzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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