Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f5798d32248390d3cd345f391aa2e07ca6c923429fb71fa74bbad2b016b1a8c' 
  AND token = 'Ohz8+X4aZsPmiVMOdRJ55iqgJMdZm1qURSqsSIIS2WM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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