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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5d8f1865d433ec6c93fe2cc1b856fd051a6557fee6cf266e4065765bd3a72568' 
  AND token = '7jW0CnlUbLctoY4Lfc79ou3hT7LXtk4qpj9FtXNQIPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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