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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '844517598ab95872e520a0a469213936dbe4d14d6c9f9041c3ea400be1538fc8' 
  AND token = 'eVsQbDVh2krDSnn+QF+eC0wwK0jgMiG9Tnit6IwH9Tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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