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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '07194d68cb1ab1c34a8e9aaf2c5a2ce43113ee68ff854fbff9516015c4e4c838' 
  AND token = 'zLDdAlzjj575fKT3DimNagWUegdl7CDDC71qaT3fdFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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