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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '03065914cc6e5dd77cc7d9a1bea86807688627510278b03d901a727d5a0c5f87' 
  AND token = 'WQUpSn3cFNcjtLXEMSC7n819WGU/XclX7TC2VIzmNmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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