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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'cde8e553e7f90c466bb2df24540b7e4302a50a72f61c770b5aadce20c5fb2c4f' 
  AND token = 'u6Up8Kg4kDG+oRgAEfLvrzZkU0sWmy1scDCVNK6kJx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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