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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '98dd9777deb913ac1fb8219d3852a5180235fd7cd19000d52939cbc1fe14464b' 
  AND token = 'zYauCSn5PAfZ+9hGX7ebkmh83+Si8GyE68UFcWZ3vDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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