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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fd70b9f83c2b211aac69d3e056f8b24ef8ec56df462dcd2b43f914ecd2224b19' 
  AND token = 'LSnonipBKYBHukn4QbBWv1TJUaBpb9Yo7eKhfhtsW3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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