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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '75eb268cae6aa8dd23fbc6848447ef29e19c7608e101d6f1d28cc94b74a943e3' 
  AND token = 'oxbXmTdIc0k+yX6S1dgZmRkRqwTcPX92naizPiG0WMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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