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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a6ffd23cb6f7c2cddaeecea669ca32b2ad9127d12cd7c4a5a805456a36ffc617' 
  AND token = 'LlhkKHOqSxTAb8c9u8cn/fCLxhPfQyFx/l96ERUHQng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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