SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3e33585ffff6b7d10ed75a22defb266a22f92218c17c05e3c9c5c3fbd19f32a8' 
  AND token = 'ki4hXmEv0SfbxR/WutjUNzN88OuX9qZI+jVVAxEKrA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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