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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4bf4e15a02eb26df3f5f78a83a0639dfc8b6d0a53573afd28f536eb65e2ea01b' 
  AND token = 'UogOASAJ7J5xFvj94XtYqeJzyXe0cDT8vq3it9k0vOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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