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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '26d494f9b9b1d1bd7c169e73f1c9c2099bc9b5e76f2e5776806aa7409a5f5efb' 
  AND token = 'ZQfvQOUMVHT9E/RxCtx71M2fD3QydX8Na61k0cgy+is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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