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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ad02ffc07d9ec11fcc79d5f1e3a40d9a1d19d471651319c186bfb0afaaf3aae9' 
  AND token = 'YeU7qZtaG7xo4HNqPMe/ywQucxQznLn6sqcug1lkY5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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