Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36c0308b187ac0cf49f29688de57909938f6376cf35d76183571620357acc478' 
  AND token = '4yiv6P0wUr1t8bUOkwas+C2N7gIAQXNCWKnqws5jMzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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