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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e060ee7c050000d5220f561118e0dbead1c8b94580f1b4f1fc241bacc2520105' 
  AND token = 'zW83oeMv5FBuh8qPOrWcODgp8YX9ELJsJg/+10X5MRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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