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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'bdb2c6ba89397b9aba7b4f69e2136cdd5bd86b75a87ac7e81583f742735c443e' 
  AND token = 'eZTz2TS3HSdcNoZFNZzoe4Gled3x5BIxUHzf/J9UfJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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