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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6b55e99dbbc0a6837ffa7a274099ccc9707c219c137ff5fe0b336d130f7eb9a5' 
  AND token = 'fCreBveYahmu5pJtd2MilfgHuEmt1s3WdWZVIhD8sZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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