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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6c071cc798bdae11d9d2ec78433dd12d66816001fd12e5126f27fa3275ee26c4' 
  AND token = 'sL1lP8/HgilCeINKEZAgkQS1JLZucDXSdXIjL9GFvT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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