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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a6783426f3d99b4300c6ffeee61dc5b4b4bc026aee9fa2d7ba6d4c935cbb8e73' 
  AND token = '/TeQJ24lWBxaTWi2ZC4aAm4sxeX3fyTROrxr45JuOec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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