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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5f644d81ce956f6749f550e0f47a036d5eff11bfdb6cf2eaa7f6bca19846df7f' 
  AND token = 'NaLyF2OE68ifJAeTXR3C1zRGemABxXsxWwgu6B7Ow+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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