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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0ffd18d4de022e824ad0e5b64d4efb90da6a8aaf8dc209e40be86547e40d60c3' 
  AND token = '6vl5qB2iS0Q75+UHjTfBYyI5Cf4LF0PdYn/JAlLuIc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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