Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bff9cfc07ce1c8cd8686988a4bebe3cad48cd93c53d8b8cbe77a584e3352cbe0' 
  AND token = 'mL3gSXw3gKsY/GnyuUEvBqHiudDSZJrn6PGwMND9/uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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