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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1352ed8ae85a4df4db862835a2bffc08f43f74e93ed0ea6ad36d21f18eaaf4aa' 
  AND token = 'LQb8o2NejkqWfiz4K3bgDoH1ALgc8fbd2xbo8szxvkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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