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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6b7381e98568bcd24afaeb3f55792b37909e635b66d80ca368219e81b785967c' 
  AND token = 'agWnmyPa3vWATI1pfMYyxzm6vmxclQmoAntIqZYq1SU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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