SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1496d7cad629bec8a6c02aaf931b607f774d0c18338d3f1c5a8aeb99eb4b596f' 
  AND token = 'zvCJ/wS0dewr5d4o/QYKY6a1XQycs14ZbxgfYjR825o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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