Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7606991f8937d651ffc829aa249c0a3533c758dfb0fabe8c2d82bea8050bd91' 
  AND token = 'rSCVKzZGcsbg+rspP0RTlO5WQDfnFJgKKxP+OEpiKko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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