Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c08f83af95d307193dedc60917f9723e3f98b74cc4de5addff26d41379253e04' 
  AND token = '41W0xRn2/Cbk1E6ogZkoVubJquqedWGgmJTR+3fs+VY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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