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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ed8326c3a56a8882a78ea8a55b2f640bfa9757ab29ac93ed9078786fccc57f61' 
  AND token = 'iOgPdo15tvO/mFVXb8YxEKQR/C6/etLkvV1eO379aTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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