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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '34bb3f695726a0edbd0eb20e652500bd88cf8a9561aca8c1e9480083dd8f0ac7' 
  AND token = 'drBS+v9QujAL3U2DytROXbe+vc09CdBvjq+dI47hCqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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