Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0be0398d865e8695983985611b4aff42f65dc49bcaade6ff2e9d28f020c3af1' 
  AND token = 'h7BU8I1frjVqja2dWtdQxS5AP8vhIxbKwBM4p8vldhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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