SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd57012d0de652fb51ad214289f7f72dc376df0b29e891f17c215fd64bf0980dc' 
  AND token = 'fmCDQn4LBr3wvpjCVhrrqhU/VoYGPpUTyyNub8e2t0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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