SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0f5a56ef9ae6d4fdb68545819950d65cd578863c5ef59cb18cb81c57f3e61704' 
  AND token = 'QzJZgm77vnXtPEp26i8paNlvki+yZ2BL2xJJvu+n2Jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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