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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '823245b0ff27a5719eb87c7a7b4ee0f759a2a91860e1181bd8e5194a9d59e981' 
  AND token = 'oHy4d/UZgOAiCDV2bMrTDSKXzAitgU8YxN4Dr5eVB7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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