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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '31fc264da5630244e9ec0c2b2fccfbe6173e80a6500a3c75819a073dcf12b10f' 
  AND token = 'ctS6KdYV7gPue7pl9HMiG4lu8IWVoSIy5h0IVPuJB1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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