SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ebd6e41e03e2d6f3309a756d17072c330b7428849fe85751e4944ed1cf556ebc' 
  AND token = 'md/AEFvxskcDmJy+hDMjMSaOqHMF4Tl+evdq2whDoKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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