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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8b0fc2f97413da58bf01ed2b1e2539f44272eb3fbb282e2689a30161cdc96aea' 
  AND token = '0IYboD5GM4oi1668kwK+ROp6Ruw4ePYPjt94gilwG4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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