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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6aeb9fc3b3cd502996f5912e2cd76997c9d79eb1130dd5060cd60b0597867038' 
  AND token = 'bDSfH10TZ8IXbcCEtM3O28ZmWkxb7gipgYTnxEh4oIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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