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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a433e32a67279951ee3ddc69aef17b4e90eb920d82b407fa0560ce3e1ed8a0d9' 
  AND token = 'fwo71GSo9BA2lpgeBcqdzgIWkr+ImdeZmfixb1mjJFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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