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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0a3c62cdbb8affd1ad999c38e751efdae8fdb9714bc9775a77ea58cadb30f456' 
  AND token = 'EzlIanfcPA68Zv5YwOWf4pkPq15/gVT/l7qp/CZkt2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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