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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e6b0e3d928af0821b486f4064c3618543f027a594fc6b52f5ac6af91d0ce99a3' 
  AND token = '5JU+ye+AUpsUOzfHoKyEbMkxKiDE0zSY6Wuuqrc8MOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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