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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7dac085de7d9a6fd2a7027e3bffff8f73a8e3fce3838abb6fefdf0a235b06a70' 
  AND token = 'CS7uEYlGRJe1Rwz0r9Bdueh9EVNjdbvuavumW7mtw/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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