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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0e47d140eb0077e3513b5e07da754fbe10255255e3f312a4976309ee4a1ab79e' 
  AND token = '0S3gm0TXQdgz9jg8FlOB6XLU5zSulJI4hnP8FqmyG0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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