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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3eaa59e99e773e1759b447a9fe371f93866c386633d371fbefd9cdf83519170c' 
  AND token = 'DnkL3L6w9oiA8LNCTBbjEfFXvc8Srk9f2UhIy/vTQTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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