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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '98c3edd5a52cf723a9f4d6c2eae41219840a1c78f688ffcd09d6a1dce2b34a41' 
  AND token = 'RDTCKeBnXYz8tNtNiATktNfGZuUr8J/SPfDcriTuhHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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